CA2100723A1 - Transponder Location and Tracking System and Method - Google Patents

Transponder Location and Tracking System and Method


Publication number
CA2100723A1 CA 2100723 CA2100723A CA2100723A1 CA 2100723 A1 CA2100723 A1 CA 2100723A1 CA 2100723 CA2100723 CA 2100723 CA 2100723 A CA2100723 A CA 2100723A CA 2100723 A1 CA2100723 A1 CA 2100723A1
Prior art keywords
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Application number
CA 2100723
Other languages
French (fr)
Other versions
CA2100723C (en
Roger J. O'connor
Peter D. Shloss
Michael Y. Nishida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DirecTV Group Inc
Original Assignee
Hughes Aircraft Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US918,734 priority Critical
Priority to US07/918,734 priority patent/US5227803A/en
Application filed by Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of CA2100723A1 publication Critical patent/CA2100723A1/en
Application granted granted Critical
Publication of CA2100723C publication Critical patent/CA2100723C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current



    • G07B15/00Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
    • G07B15/06Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
    • G07B15/063Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems using wireless information transmission between the vehicle and a fixed station
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/04Position of source determined by a plurality of spaced direction-finders


A transponder location and tracking system (100) having a phased array antenna (102, 104) mounted at a toll collection station includes a plurality of antenna array elements (112, 114, 116, 118, 120, 122) for receiving a signal from a transponder (106) mounted on a vehicle and for providing a plurality of antenna element electrical signals. A plurality of phase detectors (140, 142) are provided for comparing the phase of the electrical signals to provide a plurality of phase difference signals. A plurality of angle-of-arrival calculation processors (141, 143) is provided for converting the phase difference signals to spatial signals to define the angles-of-arrival of the vehicle transponder signal. A position calculation processor (144) is included for providing an output signal representative of the location of the vehicle in response to the defined angles-of-arrival. In a preferred embodiment, the transponder location and tracking system (100) includes a plurality of receiver processing devices (107, 108) for amplifying and filtering the electrical signals from each antenna element. The phase detectors (140, 142) then compare the phase of the electrical signals to a reference element signal. Each phase detector (140, 142) provides a digital representation of the phase difference signals.
The spatial signals represent the angle-of-arrival of the vehicle transponder signal. The position calculation processor (144) operates on the spatial signal to determine the vehicle transponder position. A tracking mechanism (154) is provided to plot the location of a moving vehicle along the roadway.
CA 2100723 1992-07-22 1993-07-16 Transponder location and tracking system and method Expired - Fee Related CA2100723C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US918,734 1992-07-22
US07/918,734 US5227803A (en) 1992-07-22 1992-07-22 Transponder location and tracking system and method

Publications (2)

Publication Number Publication Date
CA2100723A1 true CA2100723A1 (en) 1994-01-23
CA2100723C CA2100723C (en) 1996-08-06



Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2100723 Expired - Fee Related CA2100723C (en) 1992-07-22 1993-07-16 Transponder location and tracking system and method

Country Status (13)

Country Link
US (1) US5227803A (en)
EP (1) EP0580139B1 (en)
JP (1) JPH06258425A (en)
KR (1) KR970003696B1 (en)
AU (1) AU654920B2 (en)
BR (1) BR9302954A (en)
CA (1) CA2100723C (en)
DE (1) DE69324309T2 (en)
IL (1) IL106386A (en)
MX (1) MX9304404A (en)
NO (1) NO932649L (en)
NZ (1) NZ248206A (en)
TW (1) TW225587B (en)

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Also Published As

Publication number Publication date
AU654920B2 (en) 1994-11-24
AU4213893A (en) 1994-01-27
KR940006066A (en) 1994-03-23
DE69324309T2 (en) 1999-08-26
NO932649D0 (en) 1993-07-22
CA2100723C (en) 1996-08-06
NZ248206A (en) 1995-12-21
IL106386D0 (en) 1993-11-15
EP0580139B1 (en) 1999-04-07
US5227803A (en) 1993-07-13
KR970003696B1 (en) 1997-03-21
MX9304404A (en) 1994-05-31
EP0580139A2 (en) 1994-01-26
NO932649L (en) 1994-01-24
DE69324309D1 (en) 1999-05-12
IL106386A (en) 1996-06-18
JPH06258425A (en) 1994-09-16
BR9302954A (en) 1994-02-22
TW225587B (en) 1994-06-21
EP0580139A3 (en) 1994-08-17

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